Obviously they solved the memory leak problem for it to still be running.

Windows 98 was a great GUI OS, more importantly built on top of DOS. So I guess it is using visual studio type programming ( like with Windows Mugen when they made the switch from DOS ).
That being said their is a PC98 program for disks that only could be run on Windows 98.

Another thing about Windows 98. Security wise it was okay. However anybody with your computer address could waltz in and wreck havoc. That is why so many hacks was easily done during that time.
Everything was based on the trust system. Speaking of trust windows XP gave us the Thumbs.db file. This file actually could be used via command-line to browse a persons computer and specifically targeted their image files. As with Marijuana via the Nixon era and how "the war on drugs was created as a political tool to fight blacks and hippies" for us via the Bush/Bill/Obama eras we was being targeted being mostly guys rather then real surveillance. Now you have a bunch of people in jail who did nothing wrong.

Again I understand fully why we would use Windows 98 over NT ( 2000, XP, 7, 8, Deerpark, 10 ). Because it had so much security and because it was not using something simple like DOS.

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In my college science department I held a $10,000 piece of equipment that was being replaced. It had the LTP Printer Port cable on it. So many people within these areas are stuck with using this technology as it was made at the time.